I am in the process of changing these seals on my 1982 air cooled Westy.  There is a very complete write up of this procedure in the archives.  I believe Tom Young wrote it up.  Just spend a few minutes searching and you will find it.  Because the stub axle accepts a 10 mm bolt there is a really slick method for pressing in the seals which only requires a nut and bolt, washer, and short section of pipe.  Again, see the archives or the Haynes manual for a detailed write up.
Removing the old seal can be a bear.  Mine were really in there.  I ended up making three evenly spaced holes in the seal with a hammer and scratch awl.  I then screwed a sheet metal screw into each of the holes.  I then grabbed the head of the screws with a pliers and pulled straight away from the transmission.  By alternately pulling on each screw the seal came out pretty easily.  The first time I did this I actually drilled the three holes into the seal.  I don't recomend this because no matter how careful you are metal shaving fall through the back of the seal and are difficult to clean up.

Good luck,
Jake

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